GDIFF
From Just Solve the File Format Problem
GDIFF (Generic Diff) is a binary format for representing "diffs" of what has changed in a file since a previous version. It was released as a format specification submitted in 1997 to the W3C as a note, to be published in their site but not explicitly endorsed by that organization.
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Identification
A GDIFF file starts with the hex bytes d1 ff d1 ff followed by a one-byte version number.
